org.springframework.boot.web.client.ClientHttpRequestFactorySupplier Maven / Gradle / Ivy
/*
* Copyright 2012-2018 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.boot.web.client;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.function.Supplier;
import org.springframework.beans.BeanUtils;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.util.ClassUtils;
/**
* A supplier for {@link ClientHttpRequestFactory} that detects the preferred candidate
* based on the available implementations on the classpath.
*
* @author Stephane Nicoll
* @since 2.1.0
*/
public class ClientHttpRequestFactorySupplier
implements Supplier {
private static final Map REQUEST_FACTORY_CANDIDATES;
static {
Map candidates = new LinkedHashMap<>();
candidates.put("org.apache.http.client.HttpClient",
"org.springframework.http.client.HttpComponentsClientHttpRequestFactory");
candidates.put("okhttp3.OkHttpClient",
"org.springframework.http.client.OkHttp3ClientHttpRequestFactory");
REQUEST_FACTORY_CANDIDATES = Collections.unmodifiableMap(candidates);
}
@Override
public ClientHttpRequestFactory get() {
for (Map.Entry candidate : REQUEST_FACTORY_CANDIDATES
.entrySet()) {
ClassLoader classLoader = getClass().getClassLoader();
if (ClassUtils.isPresent(candidate.getKey(), classLoader)) {
Class factoryClass = ClassUtils.resolveClassName(candidate.getValue(),
classLoader);
return (ClientHttpRequestFactory) BeanUtils
.instantiateClass(factoryClass);
}
}
return new SimpleClientHttpRequestFactory();
}
}